$(document).ready(
	function()
	{
	      
		$("#odLevelList").change(function(){			
			var level = $("#odLevelList").selectedValues();		   
			if (level.length > 0 ) {
				//$.blockUI();
							
				var f;
				
				switch (level[0]){
					case '1':					
						f = "data/040.txt";
						break;
					case '2':					
						f = "data/050.txt";
						break;
					case '3':					
						f = "data/060.txt";
						break;
					case '4':					
						f = "data/060.txt";
						break;
					case '5':					
						f = "data/060.txt";
						break;
					case '6':					
						f = "data/160.txt";
						break;
					case '7':					
						f = "data/060.txt";
						break;
					case '8':					
						f = "data/060.txt";
						break;
					defaut:
					    break;
				}
				
				var o = $("#oList");	
				var d = $("#dList");
				
				o.removeOption(/./);
				d.removeOption(/./);
									
		   	    if (f) {
					$.getJSON(f,
						{},
						function(r)
						{
							o.addOption(r, false);							
							d.addOption(r, false);							
							//$.unblockUI({fadeOut:0});
						}
					);					   	    
				}
				else {
					//$.unblockUI({fadeTime: 150});
				}				
			}			
		});
	}
)